Watching Bucky talk with Clint and Sam, listening to him laugh, the pain of the last seventy-odd years faded away and Steve was completely happy.
The past suddenly didn't matter. The guilt for his failure to save Bucky on the train, and the ache afterward, missing his best friend so damned much. The shock and horror of finding that Bucky had spent decades as a helpless, hopeless, robotic Hydra assassin. And, finally, Steve's endless, seemingly fruitless search for him after the brutal battle over the Potomac. None of it mattered.
Having Bucky with him, seeing him smile – it was everything.